diff --git a/code/model/editableformfields/EditableFileField.php b/code/model/editableformfields/EditableFileField.php
index 1a9d07e..f272925 100755
--- a/code/model/editableformfields/EditableFileField.php
+++ b/code/model/editableformfields/EditableFileField.php
@@ -93,7 +93,7 @@ class EditableFileField extends EditableFormField
         );
 
         if ($this->MaxFileSizeMB > 0) {
-            $field->getValidator()->setAllowedMaxFileSize($this->MaxFileSizeMB * 1024);
+            $field->getValidator()->setAllowedMaxFileSize($this->MaxFileSizeMB * 1024 * 1024);
         } else {
             $field->getValidator()->setAllowedMaxFileSize(static::get_php_max_file_size());
         }
diff --git a/tests/EditableFileFieldTest.php b/tests/EditableFileFieldTest.php
index 46537fb..ac18023 100644
--- a/tests/EditableFileFieldTest.php
+++ b/tests/EditableFileFieldTest.php
@@ -61,7 +61,7 @@ class EditableFileFieldTest extends SapphireTest
         $fileField->write();
 
         $formField = $fileField->getFormField();
-        $this->assertEquals($formField->getValidator()->getAllowedMaxFileSize(), 256);
+        $this->assertEquals($formField->getValidator()->getAllowedMaxFileSize(), 262144);
     }
 
 }
\ No newline at end of file